acetic acid (HC2H3O2), a clear, colorless, pungent liquid that is miscible with water, alcohol, glycerin, and ether and that constitutes 3% to 5% of vinegar. Acetic acid is produced commercially by the reaction of methanol with carbon monoxide in the presence of a catalyst, or it may be obtained from ethyl alcohol by the action of many aerobic bacteria. Various concentrations are used in the manufacture of plastics, dyes, insecticides, cellulose acetate, photographic chemicals, and pharmaceutic preparations, including vaginal jellies and antimicrobial solutions for the treatment of superficial infections of the external acoustic meatus. Also called ethanoic acid.
